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Zarrin [17]
2 years ago
5

if tom spins the spinner 80 times work out an estimate for the number of times the spinner will land on 3 please help me

Mathematics
1 answer:
NNADVOKAT [17]2 years ago
7 0

Answer:

The estimated number of times the spinner will land on 3 is 20.

Step-by-step explanation:

The complete question is:

A four-sided spinner is provided. If Tom spins the spinner 80 times then work out an estimate for the number of times the spinner will land on 3.

Solution:

Assume that the four-sided spinner is unbiased.

That is all the four outcomes are equally likely to be selected.

The probability that the spinner lands on any of the four numbers is:

P(1) = P (2) = P (3) = P (4) = 0.25

It is provided that Tom spins the spinner <em>n</em> = 80 times.

The spinner can land on any of the four numbers independently.

The random variable <em>X</em>, defined as the number of times the spinner lands on 3, follows a Binomial distribution with parameters <em>n</em> = 80 and <em>p</em> = 0.25.

The expected value of <em>X</em> is:

E(X)=np

        =80\times 0.25\\=20

Thus, the estimated number of times the spinner will land on 3 is 20.

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Answer:

2.4 hr. = time working together

Step-by-step explanation:

Let x = time working together

x/6 = work done by Martin

x/4 = work done by Victor

Martin's part + Victor's part = 1 jog done

x/6 + x/4 = 1  Multiply thru by 12

2x + 3x = 12

5x = 12

x = 2.4 hr.

6 0
2 years ago
Fifteen times the square of a non-zero number is equal to 20 times number.What is the number? Its not 4/3
e-lub [12.9K]
The number is (2√3) / 3

To find the missing number, convert what it says in words to an equation:
15 {x}^{2}  = 20x
Divide both sides by 15:
{x}^{2}  =  \frac{20}{15}   \\  \\  {x}^{2}  =  \frac{4}{3}
Take the square root:
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4 0
3 years ago
An item has listed price of $30. If the sales tax is 4% how much is the sales tax (in dollars)
slega [8]

Answer: $1.20

Step-by-step explanation:

To calculate sales tax, multiply the price by the tax percentage.

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6 0
3 years ago
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salantis [7]

Answer:

252

Step-by-step explanation:

Split up the shape

First part:

12*12=144

Second part:

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((12+6)/2)*12

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<u>Plz mark brainliest if this was helpful</u>

8 0
3 years ago
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Answer:The area of the bottom of the jewelry box is 139.75 inch^2

Step-by-step explanation:

The area of a rectangle is expressed as

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The length of the rectangular bottom of dais jewelry box is 5 3/8 inch. Converting to improper fraction, it becomes 43/8 inch.

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The area of the bottom of the jewelry box will be

43/8 × 13/4 = 559/32 = 139.75

7 0
3 years ago
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